Watch Glasses
Watch Glasses
Watch glasses are shallow, circular, and concave, and may be used as beaker or flask covers, weighing, crystallization, and drying. Watch glasses are available in a variety of sizes and materials compatible with virtually all industrial chemicals and solvents. Some models are non-stick and some can withstand temperatures from cryogenic ranges up to 260°C.
Types of Watch Glasses
Watch glasses are normally made from glass (borosilicate glass or soda lime glass) or from plastics such as autoclavable polypropylene or chemical-resistant PTFE. The plastic versions are often single-use and disposable to prevent sample cross-contamination.
• Glass versions may be constructed using shatter-resistant compositions
• Glass versions often have polished, fused, or ground edges for cut-free, safe handling and durability
• Plastic versions may be used at low temperatures and are also lighter in weight
• All versions are available in a range of diameters, thicknesses, and capacities depending upon the intended application
What are Watch Glasses Used for?
• Holding biological samples or specimens for examination, either with the naked eye or under the microscope
• Demonstrations and displays, particularly in educational or classroom settings
• Observation of chemical processes such as precipitation or crystallization
• Weighing of powders, crystals, or liquids
• Gentle heating and/or evaporation of solids and liquids (borosilicate versions)
• Temporary covers for beakers, cylinders, and other containers to reduce evaporation and minimize ingress of dust and other airborne contamination (the curved surface helps prevent sliding and helps return of condensed liquid to the beaker)
PYREX™ Ribbed Watch Glass/Beaker Cover
Ribbed design permits reflux of digestate and escape of excess vapor, thus preventing vapor buildup.
Fisherbrand™ PTFE Watch Glasses
Inert to all materials except molten alkali metals.
PYREX™ Watch Glass/Beaker Cover with Fire-Polished Edges
Molded for table stacking
DWK Life Sciences DURAN™ Watch Glass Dish with Fused Rim
Watch Glass Dish with Fused Rim
Promotions are available
Fisherbrand™ PTFE Watch Glasses
Inert to all materials except molten alkali metals.
Fisherbrand™ PTFE Watch Glasses
Inert to all materials except molten alkali metals.
PYREX™ Watch Glasses
Heavy walls and uniform fire-polished edges for strength.
Cole-Parmer Watch Glass 25mm 12/pk
Cole-Parmer Watch Glass 25mm 12/pk, Manufactured from clear glass sheet (1.8 to 2.0mm thick), these watch glasses are fire ground and have polished edges. Concave shape prevents sliding and return of condensation to the beaker.
MOLDPRO INC Ribbed Watch Glass for 50 mL Digestion Tube, Clear, 1000/pkg, PP Homopolymer
MP-121 Ribbed Watch Glass is designed to fit all 50 mL digestion vessels. Features large center stem for easy handling. • Made from virgin polypropylene • 1000 pieces/case • Direct replacement for Environmental Express SC505 and SCP Science 010-500-081
Chemglass Life Sciences Plate glass, square, borosilicate, 4in X 4in X 1/16
Plate glass, square, borosilicate, 4in X 4in X 1/16. Pyrex or Duran borosilicate plate glass. The 1/16in, 1/8in and 1/4in thick plates have edges that are cut and swiped. The 1/2in thick and over have ground edges.
Chemglass Life Sciences Plate glass, square, borosilicate, 12in X 12in X 1/4
Plate glass, square, borosilicate, 12in X 12in X 1/4. Pyrex or Duran borosilicate plate glass. The 1/16in, 1/8in and 1/4in thick plates have edges that are cut and swiped. The 1/2in thick and over have ground edges.
Chemglass Life Sciences Plate glass, disc, borosilicate, 6in Diameter X 1/2in Thick
Plate glass, disc, borosilicate, 6in Diameter X 1/2in Thick. Pyrex or Duran borosilicate glass disc. Edges on all sizes are ground and chamfered.
Chemglass Life Sciences Plate glass, square, borosilicate, 6in X 6in X 1/8
Plate glass, square, borosilicate, 6in X 6in X 1/8. Pyrex or Duran borosilicate plate glass. The 1/16in, 1/8in and 1/4in thick plates have edges that are cut and swiped. The 1/2in thick and over have ground edges.
Chemglass Life Sciences Plate glass, disc, borosilicate, 8in Diameter X 1/4in Thick
Plate glass, disc, borosilicate, 8in Diameter X 1/4in Thick. Plate glass, disc, borosilicate, 8in Diameter X 1/4in Thick. Pyrex or Duran borosilicate glass disc. Edges on all sizes are ground and chamfered.
Chemglass Life Sciences Plate glass, disc, borosilicate, 4in Diameter X 1/8in Thick
Plate glass, disc, borosilicate, 4in Diameter X 1/8in Thick. Pyrex or Duran borosilicate glass disc. Edges on all sizes are ground and chamfered.
Chemglass Life Sciences Plate glass, disc, borosilicate, 4in Diameter X 1/16in Thick
Plate glass, disc, borosilicate, 4in Diameter X 1/16in Thick. Pyrex or Duran borosilicate glass disc. Edges on all sizes are ground and chamfered.
Chemglass Life Sciences Plate glass, square, borosilicate, 2in X 2in X 1/8
Plate glass, square, borosilicate, 2in X 2in X 1/8. Pyrex or Duran borosilicate plate glass. The 1/16in, 1/8in and 1/4in thick plates have edges that are cut and swiped. The 1/2in thick and over have ground edges.
Chemglass Life Sciences Plate glass, square, borosilicate, 8in X 8in X 1/4
Plate glass, square, borosilicate, 8in X 8in X 1/4. Pyrex or Duran borosilicate plate glass. The 1/16in, 1/8in and 1/4in thick plates have edges that are cut and swiped. The 1/2in thick and over have ground edges.
Chemglass Life Sciences Plate glass, disc, borosilicate, 6in Diameter X 1/16in Thick
Plate glass, disc, borosilicate, 6in Diameter X 1/16in Thick. Pyrex or Duran borosilicate glass disc. Edges on all sizes are ground and chamfered.
Chemglass Life Sciences Plate glass, square, borosilicate, 12in X 12in X 1/8
Plate glass, square, borosilicate, 12in X 12in X 1/8. Pyrex or Duran borosilicate plate glass. The 1/16in, 1/8in and 1/4in thick plates have edges that are cut and swiped. The 1/2in thick and over have ground edges.
Chemglass Life Sciences Plate glass, disc, borosilicate, 4in Diameter X 1/2in Thick
Plate glass, disc, borosilicate, 4in Diameter X 1/2in Thick. Pyrex or Duran borosilicate glass disc. Edges on all sizes are ground and chamfered.
Chemglass Life Sciences Plate glass, square, borosilicate, 6in X 6in X 1/16
Plate glass, square, borosilicate, 6in X 6in X 1/16. Pyrex or Duran borosilicate plate glass. The 1/16in, 1/8in and 1/4in thick plates have edges that are cut and swiped. The 1/2in thick and over have ground edges.
Chemglass Life Sciences Plate glass, square, borosilicate, 4in X 4in X 1/8
Plate glass, square, borosilicate, 4in X 4in X 1/8. Pyrex or Duran borosilicate plate glass. The 1/16in, 1/8in and 1/4in thick plates have edges that are cut and swiped. The 1/2in thick and over have ground edges.
Chemglass Life Sciences Plate glass, disc, borosilicate, 2in Diameter X 1/4in Thick
Plate glass, disc, borosilicate, 2in Diameter X 1/4in Thick. Pyrex or Duran borosilicate glass disc. Edges on all sizes are ground and chamfered.
Chemglass Life Sciences Plate glass, disc, borosilicate, 8in Diameter X 1/8in Thick
Plate glass, disc, borosilicate, 8in Diameter X 1/8in Thick. Pyrex or Duran borosilicate glass disc. Edges on all sizes are ground and chamfered.